Hmmmm. You either gained a ton of downforce or, at some magical speed, turned into Chitty Chitty Bang Bang.
That's ringing a bell way back in my head, but I can't recall the details. Something about an article in a 50's Popular Science or Popular Mechanics...what I remember looked similar, but a bit fatter.......
I would love to see a picture of one of those on the roof of a 59 Impala 4 door hardtop with the flat roof and wrap around rear window. That body style I think really would look like it could fly with that aero cabana.